Functional Optical Film Post-Production Additive Embedding
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Solution Overview
Problem
The existing methods for incorporating functional additives into high-quality optical films are costly and inefficient, particularly due to the high expense of solvent recovery in the solvent casting process and issues with additive distribution during solvent evaporation.
Innovation Solution
A method involving the co-migration of additives with a solvent or dispersion into extrudable resins to embed additives below the film surface, allowing for uniform distribution and high reproducibility in optical quality films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If additives are added to the dope solution formation stage during solvent casting, then functional additives can be incorporated into optical films, but poor color distribution and bleeding out of additives occur during solvent evaporation
Solution Approach 1:
The patent applies preliminary action by coating the dope solution with additives onto the film surface after the film has been formed through solvent casting, rather than mixing additives into the dope solution before casting. This preliminary coating step allows the film structure to be established first, preventing the bleeding and poor distribution issues that occur when additives are present during solvent evaporation.
2Reliability
If solvent casting process is used to produce optical-quality films, then high optical transparency and isotropy are achieved, but the process becomes prohibitively expensive due to expensive condensation process for solvent recovery
Solution Approach 1:
The patent extracts the expensive solvent recovery condensation process from the manufacturing sequence by using water-based or alcohol-based solvents that can be removed by evaporation or simple drying. This extraction eliminates the need for expensive condensation equipment and processes while maintaining optical film quality, thereby significantly reducing manufacturing costs.
Solution Approach 2:
The patent employs cheap, easily removable solvents (water, alcohol) instead of expensive halogenated hydrocarbons requiring complex recovery systems. These solvents can be evaporated or dried without expensive condensation equipment, making the manufacturing process economically viable while maintaining optical film quality.
3Ease of manufacture
If halogenated hydrocarbon solvent is used for dope solution, then solvent casting can proceed, but escape of halogenated solvent into atmosphere requires environmentally controlled chamber
Solution Approach 1:
The patent converts the harmful aspect of solvent use by switching from halogenated hydrocarbons (which are toxic and require environmental controls) to water-based or alcohol-based solvents. These alternative solvents are environmentally friendly, non-toxic, and can be safely evaporated or dried without requiring expensive environmentally controlled chambers, thus eliminating the harmful factor while maintaining processability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of high-quality, functionalized optical films at a significantly lower cost than traditional methods, while ensuring uniform additive distribution and high reproducibility.
Implementation Method 1
incorporation of dyes and other additives into optical films by co-migration with a solvent
Implementation Method 2
evaporating at least a portion of the solvent
Data Source
AI summary
The disclosure provides post-production methods for functionalization of optical quality films produced by top tier manufactures. The methods disclosed herein allow for the incorporation of different additives into existing films.